.b_btn{
    color: rgba(0, 0, 0, 0.65);
    background-color: #fff;
    border-color: #d9d9d9;
    transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
    line-height: 1;
    text-align: center;
    font-weight: 500;
    width: 80px;
    height: 28px;
    border-radius: 4px;
    border: 1px solid rgb(217,217,217);
    cursor: pointer;
}
.b_btn:hover{
    border-color: #00BBFF;
    color: #00BBFF;
}